#428BB8#428BB8

#428BB8 is a mid, moderate cyan. Relative luminance 0.231; OKLCH L 60.9% C 0.100 H 238.5°. Best body text is #000000 at 5.62:1 contrast (WCAG AA passes).

Color values

HEX	#428BB8
RGB	rgb(66, 139, 184)
HSL	hsl(203, 47%, 49%)
HSV	hsv(203, 64%, 72%)
CMYK	cmyk(64.1%, 24.5%, 0%, 27.8%)
CIE-LAB	lab(55.16, -8.68, -30.30)
CIE-LCH	lch(55.16, 31.52, 254.01°)
OKLab	oklab(60.94% -0.0522 -0.0851)
OKLCH	oklch(60.94% 0.1 238.5)
XYZ	xyz(20.1278, 23.0821, 48.7327)
Luminance	0.2308 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#428BB8 #B86F42

analogous

#42B8AA #428BB8 #4250B8

triadic

#428BB8 #B8428B #8BB842

tetradic

#428BB8 #AA42B8 #B86F42 #50B842

square

#428BB8 #AA42B8 #B86F42 #50B842

split-complementary

#428BB8 #B84250 #B8AA42

monochromatic

#22475E #32698B #428BB8 #6DA7CB #9AC2DB

Accessibility & contrast

On white

3.74

#428BB8 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.62

#428BB8 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #428BB8

5.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##428BB8	#FFFFFF	#000000	##000000
##428BB8	1.00	3.74	5.62	5.62
#FFFFFF	3.74	1.00	21.00	21.00
#000000	5.62	21.00	1.00	1.00
##000000	5.62	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#768BBA

Deuteranopia (green-blind)

#667FB7

Tritanopia (blue-blind)

#00969A

Achromatopsia (no color)

#848484

Design tokens & code

CSS

--color: #428bb8;
/* rgb */ color: rgb(66, 139, 184);
/* oklch */ color: oklch(60.9% 0.100 238.5);

Tailwind

colors: {
  custom: {
    50: '#82accd',
    500: '#428bb8',
    950: '#000000',
  },
}

SCSS

$custom: #428bb8;
$custom-light: #82accd;
$custom-dark: #000000;

JSON

{
  "hex": "#428bb8",
  "rgb": {
    "r": 66,
    "g": 139,
    "b": 184
  },
  "hsl": {
    "h": 202.881,
    "s": 47.2,
    "l": 49.02
  },
  "oklch": {
    "l": 0.60944,
    "c": 0.0998,
    "h": 238.5
  },
  "luminance": 0.23084
}

Semantic roles & 50–950 ramp

primary

#428BB8

secondary

#C7A48F

accent

#8451D7

background

#F8FAFC

surface

#F0F4F9

border

#CBCED2

text

#0B1013

muted

#7C7F82

Preview Lab

Preview with #428BB8

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →